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Author Topic:   GT 40 heads.........
powrshftr
Journeyman

Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003

posted 01-10-2004 11:46 PM     Click Here to See the Profile for powrshftr   Click Here to Email powrshftr     Edit/Delete Message   Reply w/Quote
Will I be wasting my time trying to get a set of iron GT 40's to flow #'s in the ballpark of 250cfm int./200cfm ex.?Recently got a deal on a set and was hoping to squeeze some power out of them with a little grinding.Hoping to use them on the turbo 306ci motor;shooting for the 550-580hp area with 10psi boost,and the x303 cam.Am I off my freakin' rocker,or will it be a slam dunk?Please be gentle.LOL!

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DRIVE IT LIKE YOU STOLE IT!!!!!!!!!!!

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Moneymaker
Administrator

Posts: 25883
From: Lyons, IL, USA
Registered: May 99

posted 01-10-2004 11:49 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
If you got souch a great deal on them, sell them and use the profits for some serious heads. Edelbrock, AFR, etc.

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Alex Denysenko
Co-Administrator and Moderator

NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

The Barry of BarrysGrrl

Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com

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TomP
Gearhead

Posts: 5761
From: Delta BC Canada
Registered: Dec 99

posted 01-10-2004 11:56 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
I agree with Alex. The GT40 has no more potential after porting than a normal 5.0L head as the castings are very similar.

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CHIPSBAD67
Gearhead

Posts: 396
From: LOU,KY;USA
Registered: Sep 2003

posted 01-11-2004 12:01 AM     Click Here to See the Profile for CHIPSBAD67   Click Here to Email CHIPSBAD67     Edit/Delete Message   Reply w/Quote
the more power you can make n/a, the more you'll make when you add the turbo. how much did you get the gt-40's for?

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306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES

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capri man
Gearhead

Posts: 6417
From: doerun, ga.
Registered: Nov 2000

posted 01-11-2004 01:34 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
dont know if this will help or how accurate it is but here it is anyway. i just stumbled up on it.
http://phystutor.tripod.com/stang/head_swapping.html

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mike r
racing is real
everything else is just a game.
81 capri-7.47 @90mph 1/8
1.54 60 ft.

http://www.angelfire.com/ny5/billswebsite/pg06.html

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capri man
Gearhead

Posts: 6417
From: doerun, ga.
Registered: Nov 2000

posted 01-11-2004 01:38 PM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
heres another one.
http://www.allfordmustangs.com/Detailed/630.shtml

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mike r
racing is real
everything else is just a game.
81 capri-7.47 @90mph 1/8
1.54 60 ft.

http://www.angelfire.com/ny5/billswebsite/pg06.html

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powrshftr
Journeyman

Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003

posted 01-11-2004 02:57 PM     Click Here to See the Profile for powrshftr   Click Here to Email powrshftr     Edit/Delete Message   Reply w/Quote
Thanks CapriMan!

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JCQuinn@work
Gearhead

Posts: 826
From: Lakewood, CO, USA
Registered: Jun 2001

posted 01-12-2004 10:44 AM     Click Here to See the Profile for JCQuinn@work   Click Here to Email JCQuinn@work     Edit/Delete Message   Reply w/Quote
The GT40 does flow better than standard 302 heads but not as well as aftermarket heads. Here is a source for comparative flow numbers. It isn't inclusive of some of the newer heads but is very informative.

http://www.jason.fletcher.net/tech/flowdata/castiron.htm

John

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